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Hydrology & Irrigation

Lacey’s Regime Theory

A channel des...

Question

A channel designed by Lacey's theory has a velocity of 0.88 m/sec. The silt factor is 1.1. then hydraulic mean depth will be

A

1.95 m

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B

1.76 m

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C

1.63 m

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D

1.50 m

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Solution

The correct option is B 1.76 m
Hydraulic mean depth,

$R = \frac{5}{2} \frac{V^{2}}{f} = \frac{5}{2} \times \frac{(0.88)^{2}}{1.1} = 1.76 m$

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